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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(20/2)*x+10/x+7+8 = (24/2)*x // - (24/2)*x
(20/2)*x-((24/2)*x)+10/x+7+8 = 0
(20/2)*x-12*x+10/x+7+8 = 0
10*x^-1-2*x^1+15*x^0 = 0
(15*x^1-2*x^2+10*x^0)/(x^1) = 0 // * x^2
x^1*(15*x^1-2*x^2+10*x^0) = 0
x^1
15*x-2*x^2+10 = 0
15*x-2*x^2+10 = 0
DELTA = 15^2-(-2*4*10)
DELTA = 305
DELTA > 0
x = (305^(1/2)-15)/(-2*2) or x = (-305^(1/2)-15)/(-2*2)
x = (305^(1/2)-15)/(-4) or x = (305^(1/2)+15)/4
x in { (305^(1/2)-15)/(-4), (305^(1/2)+15)/4}
x in { (305^(1/2)-15)/(-4), (305^(1/2)+15)/4 }
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